Steve Langham’s database is an invaluable resource and can be found here:
https://naturalacuity.com/SwordSearc...d-02f606c626ed
If you click on the i button it brings you to the sources Steve has for his entry One observation though, Steve only lists dates he has a period source for, so in this instance, if T Symmons was using blades supplied by J J Runkel then he must have been operating before 1808 when Runkel ceased importing from Solingen.